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Singer Katy Perry says she will collaborate with Taylor Swift if she apologises to her.

Perry was answering to fans’ questions on Twitter on Saturday when one user asked if she would ever collaborate with Swift.

The two pop stars have been in a long-running feud that has yet to be settled, but the shade they have thrown at each other has never been a direct attack.

“Katy Perry will you collaborate with Taylor Swift?” the user asked.

“If she says sorry, sure!” Perry responded.

Swift and Perry’s feud goes back when Swift claimed in an interview that a pop star tried to steal her tour’s dancers.

Eventually people deduced that Swift was referring to Perry, who tweeted to fans: “Watch out for the Regina George in sheep’s clothing.”